I booked an award stay and see that there is an option for a paid upgrade available to a better room. At the bottom of the page it says "Diamond and Platinum Hyatt Gold Passport members are eligible for a complimentary upgrade, based on program guidelines, if available at check-in."

So does that mean as a Diamond if I select one of the paid upgrade options, the fee will be waived? Or does it mean that if I select it, I will still be charged? But if I don't select anything I would have had the opportunity for an free upgrade at check in?